release/src-rt-6.x/linux/linux-2.6/fs/gfs2/sys.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/module.h>
  16 #include <linux/kobject.h>
  17 #include <linux/gfs2_ondisk.h>
  18 #include <linux/lm_interface.h>
  19 #include <asm/uaccess.h>
  20
  21 #include "gfs2.h"
  22 #include "incore.h"
  23 #include "lm.h"
  24 #include "sys.h"
  25 #include "super.h"
  26 #include "glock.h"
  27 #include "quota.h"
  28 #include "util.h"
  29
  30 char *gfs2_sys_margs;
  31 spinlock_t gfs2_sys_margs_lock;
  32
  33 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
  34 {
  35         return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_vfs->s_id);
  36 }
  37
  38 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
  39 {
  40         return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
  41 }
  42
  43 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
  44 {
  45         unsigned int count;
  46
  47         mutex_lock(&sdp->sd_freeze_lock);
  48         count = sdp->sd_freeze_count;
  49         mutex_unlock(&sdp->sd_freeze_lock);
  50
  51         return snprintf(buf, PAGE_SIZE, "%u\n", count);
  52 }
  53
  54 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
  55 {
  56         ssize_t ret = len;
  57         int error = 0;
  58         int n = simple_strtol(buf, NULL, 0);
  59
  60         if (!capable(CAP_SYS_ADMIN))
  61                 return -EACCES;
  62
  63         switch (n) {
  64         case 0:
  65                 gfs2_unfreeze_fs(sdp);
  66                 break;
  67         case 1:
  68                 error = gfs2_freeze_fs(sdp);
  69                 break;
  70         default:
  71                 ret = -EINVAL;
  72         }
  73
  74         if (error)
  75                 fs_warn(sdp, "freeze %d error %d", n, error);
  76
  77         return ret;
  78 }
  79
  80 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
  81 {
  82         unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
  83         return snprintf(buf, PAGE_SIZE, "%u\n", b);
  84 }
  85
  86 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
  87 {
  88         if (!capable(CAP_SYS_ADMIN))
  89                 return -EACCES;
  90
  91         if (simple_strtol(buf, NULL, 0) != 1)
  92                 return -EINVAL;
  93
  94         gfs2_lm_withdraw(sdp,
  95                 "GFS2: fsid=%s: withdrawing from cluster at user's request\n",
  96                 sdp->sd_fsname);
  97         return len;
  98 }
  99
 100 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
 101                                  size_t len)
 102 {
 103         if (!capable(CAP_SYS_ADMIN))
 104                 return -EACCES;
 105
 106         if (simple_strtol(buf, NULL, 0) != 1)
 107                 return -EINVAL;
 108
 109         gfs2_statfs_sync(sdp);
 110         return len;
 111 }
 112
 113 static ssize_t shrink_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 114 {
 115         if (!capable(CAP_SYS_ADMIN))
 116                 return -EACCES;
 117
 118         if (simple_strtol(buf, NULL, 0) != 1)
 119                 return -EINVAL;
 120
 121         gfs2_gl_hash_clear(sdp, NO_WAIT);
 122         return len;
 123 }
 124
 125 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
 126                                 size_t len)
 127 {
 128         if (!capable(CAP_SYS_ADMIN))
 129                 return -EACCES;
 130
 131         if (simple_strtol(buf, NULL, 0) != 1)
 132                 return -EINVAL;
 133
 134         gfs2_quota_sync(sdp);
 135         return len;
 136 }
 137
 138 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
 139                                         size_t len)
 140 {
 141         u32 id;
 142
 143         if (!capable(CAP_SYS_ADMIN))
 144                 return -EACCES;
 145
 146         id = simple_strtoul(buf, NULL, 0);
 147
 148         gfs2_quota_refresh(sdp, 1, id);
 149         return len;
 150 }
 151
 152 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
 153                                          size_t len)
 154 {
 155         u32 id;
 156
 157         if (!capable(CAP_SYS_ADMIN))
 158                 return -EACCES;
 159
 160         id = simple_strtoul(buf, NULL, 0);
 161
 162         gfs2_quota_refresh(sdp, 0, id);
 163         return len;
 164 }
 165
 166 struct gfs2_attr {
 167         struct attribute attr;
 168         ssize_t (*show)(struct gfs2_sbd *, char *);
 169         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
 170 };
 171
 172 #define GFS2_ATTR(name, mode, show, store) \
 173 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
 174
 175 GFS2_ATTR(id,                  0444, id_show,       NULL);
 176 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
 177 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
 178 GFS2_ATTR(shrink,              0200, NULL,          shrink_store);
 179 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
 180 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
 181 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
 182 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
 183 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
 184
 185 static struct attribute *gfs2_attrs[] = {
 186         &gfs2_attr_id.attr,
 187         &gfs2_attr_fsname.attr,
 188         &gfs2_attr_freeze.attr,
 189         &gfs2_attr_shrink.attr,
 190         &gfs2_attr_withdraw.attr,
 191         &gfs2_attr_statfs_sync.attr,
 192         &gfs2_attr_quota_sync.attr,
 193         &gfs2_attr_quota_refresh_user.attr,
 194         &gfs2_attr_quota_refresh_group.attr,
 195         NULL,
 196 };
 197
 198 static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
 199                               char *buf)
 200 {
 201         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 202         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
 203         return a->show ? a->show(sdp, buf) : 0;
 204 }
 205
 206 static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
 207                                const char *buf, size_t len)
 208 {
 209         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 210         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
 211         return a->store ? a->store(sdp, buf, len) : len;
 212 }
 213
 214 static struct sysfs_ops gfs2_attr_ops = {
 215         .show  = gfs2_attr_show,
 216         .store = gfs2_attr_store,
 217 };
 218
 219 static struct kobj_type gfs2_ktype = {
 220         .default_attrs = gfs2_attrs,
 221         .sysfs_ops     = &gfs2_attr_ops,
 222 };
 223
 224 static struct kset gfs2_kset = {
 225         .kobj   = {.name = "gfs2"},
 226         .ktype  = &gfs2_ktype,
 227 };
 228
 229 /*
 230  * display struct lm_lockstruct fields
 231  */
 232
 233 struct lockstruct_attr {
 234         struct attribute attr;
 235         ssize_t (*show)(struct gfs2_sbd *, char *);
 236 };
 237
 238 #define LOCKSTRUCT_ATTR(name, fmt)                                          \
 239 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 240 {                                                                           \
 241         return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_lockstruct.ls_##name); \
 242 }                                                                           \
 243 static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name)
 244
 245 LOCKSTRUCT_ATTR(jid,      "%u\n");
 246 LOCKSTRUCT_ATTR(first,    "%u\n");
 247 LOCKSTRUCT_ATTR(lvb_size, "%u\n");
 248 LOCKSTRUCT_ATTR(flags,    "%d\n");
 249
 250 static struct attribute *lockstruct_attrs[] = {
 251         &lockstruct_attr_jid.attr,
 252         &lockstruct_attr_first.attr,
 253         &lockstruct_attr_lvb_size.attr,
 254         &lockstruct_attr_flags.attr,
 255         NULL,
 256 };
 257
 258 /*
 259  * display struct gfs2_args fields
 260  */
 261
 262 struct args_attr {
 263         struct attribute attr;
 264         ssize_t (*show)(struct gfs2_sbd *, char *);
 265 };
 266
 267 #define ARGS_ATTR(name, fmt)                                                \
 268 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 269 {                                                                           \
 270         return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_args.ar_##name);       \
 271 }                                                                           \
 272 static struct args_attr args_attr_##name = __ATTR_RO(name)
 273
 274 ARGS_ATTR(lockproto,       "%s\n");
 275 ARGS_ATTR(locktable,       "%s\n");
 276 ARGS_ATTR(hostdata,        "%s\n");
 277 ARGS_ATTR(spectator,       "%d\n");
 278 ARGS_ATTR(ignore_local_fs, "%d\n");
 279 ARGS_ATTR(localcaching,    "%d\n");
 280 ARGS_ATTR(localflocks,     "%d\n");
 281 ARGS_ATTR(debug,           "%d\n");
 282 ARGS_ATTR(upgrade,         "%d\n");
 283 ARGS_ATTR(num_glockd,      "%u\n");
 284 ARGS_ATTR(posix_acl,       "%d\n");
 285 ARGS_ATTR(quota,           "%u\n");
 286 ARGS_ATTR(suiddir,         "%d\n");
 287 ARGS_ATTR(data,            "%d\n");
 288
 289 /* one oddball doesn't fit the macro mold */
 290 static ssize_t noatime_show(struct gfs2_sbd *sdp, char *buf)
 291 {
 292         return snprintf(buf, PAGE_SIZE, "%d\n",
 293                         !!test_bit(SDF_NOATIME, &sdp->sd_flags));
 294 }
 295 static struct args_attr args_attr_noatime = __ATTR_RO(noatime);
 296
 297 static struct attribute *args_attrs[] = {
 298         &args_attr_lockproto.attr,
 299         &args_attr_locktable.attr,
 300         &args_attr_hostdata.attr,
 301         &args_attr_spectator.attr,
 302         &args_attr_ignore_local_fs.attr,
 303         &args_attr_localcaching.attr,
 304         &args_attr_localflocks.attr,
 305         &args_attr_debug.attr,
 306         &args_attr_upgrade.attr,
 307         &args_attr_num_glockd.attr,
 308         &args_attr_posix_acl.attr,
 309         &args_attr_quota.attr,
 310         &args_attr_suiddir.attr,
 311         &args_attr_data.attr,
 312         &args_attr_noatime.attr,
 313         NULL,
 314 };
 315
 316 /*
 317  * display counters from superblock
 318  */
 319
 320 struct counters_attr {
 321         struct attribute attr;
 322         ssize_t (*show)(struct gfs2_sbd *, char *);
 323 };
 324
 325 #define COUNTERS_ATTR(name, fmt)                                            \
 326 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 327 {                                                                           \
 328         return snprintf(buf, PAGE_SIZE, fmt,                                \
 329                         (unsigned int)atomic_read(&sdp->sd_##name));        \
 330 }                                                                           \
 331 static struct counters_attr counters_attr_##name = __ATTR_RO(name)
 332
 333 COUNTERS_ATTR(glock_count,      "%u\n");
 334 COUNTERS_ATTR(glock_held_count, "%u\n");
 335 COUNTERS_ATTR(inode_count,      "%u\n");
 336 COUNTERS_ATTR(reclaimed,        "%u\n");
 337
 338 static struct attribute *counters_attrs[] = {
 339         &counters_attr_glock_count.attr,
 340         &counters_attr_glock_held_count.attr,
 341         &counters_attr_inode_count.attr,
 342         &counters_attr_reclaimed.attr,
 343         NULL,
 344 };
 345
 346 /*
 347  * get and set struct gfs2_tune fields
 348  */
 349
 350 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 351 {
 352         return snprintf(buf, PAGE_SIZE, "%u %u\n",
 353                         sdp->sd_tune.gt_quota_scale_num,
 354                         sdp->sd_tune.gt_quota_scale_den);
 355 }
 356
 357 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 358                                  size_t len)
 359 {
 360         struct gfs2_tune *gt = &sdp->sd_tune;
 361         unsigned int x, y;
 362
 363         if (!capable(CAP_SYS_ADMIN))
 364                 return -EACCES;
 365
 366         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 367                 return -EINVAL;
 368
 369         spin_lock(&gt->gt_spin);
 370         gt->gt_quota_scale_num = x;
 371         gt->gt_quota_scale_den = y;
 372         spin_unlock(&gt->gt_spin);
 373         return len;
 374 }
 375
 376 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 377                         int check_zero, const char *buf, size_t len)
 378 {
 379         struct gfs2_tune *gt = &sdp->sd_tune;
 380         unsigned int x;
 381
 382         if (!capable(CAP_SYS_ADMIN))
 383                 return -EACCES;
 384
 385         x = simple_strtoul(buf, NULL, 0);
 386
 387         if (check_zero && !x)
 388                 return -EINVAL;
 389
 390         spin_lock(&gt->gt_spin);
 391         *field = x;
 392         spin_unlock(&gt->gt_spin);
 393         return len;
 394 }
 395
 396 struct tune_attr {
 397         struct attribute attr;
 398         ssize_t (*show)(struct gfs2_sbd *, char *);
 399         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
 400 };
 401
 402 #define TUNE_ATTR_3(name, show, store)                                        \
 403 static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 404
 405 #define TUNE_ATTR_2(name, store)                                              \
 406 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 407 {                                                                             \
 408         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 409 }                                                                             \
 410 TUNE_ATTR_3(name, name##_show, store)
 411
 412 #define TUNE_ATTR(name, check_zero)                                           \
 413 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 414 {                                                                             \
 415         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 416 }                                                                             \
 417 TUNE_ATTR_2(name, name##_store)
 418
 419 #define TUNE_ATTR_DAEMON(name, process)                                       \
 420 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 421 {                                                                             \
 422         ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len);      \
 423         wake_up_process(sdp->sd_##process);                                   \
 424         return r;                                                             \
 425 }                                                                             \
 426 TUNE_ATTR_2(name, name##_store)
 427
 428 TUNE_ATTR(demote_secs, 0);
 429 TUNE_ATTR(incore_log_blocks, 0);
 430 TUNE_ATTR(log_flush_secs, 0);
 431 TUNE_ATTR(jindex_refresh_secs, 0);
 432 TUNE_ATTR(quota_warn_period, 0);
 433 TUNE_ATTR(quota_quantum, 0);
 434 TUNE_ATTR(atime_quantum, 0);
 435 TUNE_ATTR(max_readahead, 0);
 436 TUNE_ATTR(complain_secs, 0);
 437 TUNE_ATTR(reclaim_limit, 0);
 438 TUNE_ATTR(statfs_slow, 0);
 439 TUNE_ATTR(new_files_jdata, 0);
 440 TUNE_ATTR(new_files_directio, 0);
 441 TUNE_ATTR(quota_simul_sync, 1);
 442 TUNE_ATTR(quota_cache_secs, 1);
 443 TUNE_ATTR(stall_secs, 1);
 444 TUNE_ATTR(statfs_quantum, 1);
 445 TUNE_ATTR_DAEMON(scand_secs, scand_process);
 446 TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
 447 TUNE_ATTR_DAEMON(logd_secs, logd_process);
 448 TUNE_ATTR_DAEMON(quotad_secs, quotad_process);
 449 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 450
 451 static struct attribute *tune_attrs[] = {
 452         &tune_attr_demote_secs.attr,
 453         &tune_attr_incore_log_blocks.attr,
 454         &tune_attr_log_flush_secs.attr,
 455         &tune_attr_jindex_refresh_secs.attr,
 456         &tune_attr_quota_warn_period.attr,
 457         &tune_attr_quota_quantum.attr,
 458         &tune_attr_atime_quantum.attr,
 459         &tune_attr_max_readahead.attr,
 460         &tune_attr_complain_secs.attr,
 461         &tune_attr_reclaim_limit.attr,
 462         &tune_attr_statfs_slow.attr,
 463         &tune_attr_quota_simul_sync.attr,
 464         &tune_attr_quota_cache_secs.attr,
 465         &tune_attr_stall_secs.attr,
 466         &tune_attr_statfs_quantum.attr,
 467         &tune_attr_scand_secs.attr,
 468         &tune_attr_recoverd_secs.attr,
 469         &tune_attr_logd_secs.attr,
 470         &tune_attr_quotad_secs.attr,
 471         &tune_attr_quota_scale.attr,
 472         &tune_attr_new_files_jdata.attr,
 473         &tune_attr_new_files_directio.attr,
 474         NULL,
 475 };
 476
 477 static struct attribute_group lockstruct_group = {
 478         .name = "lockstruct",
 479         .attrs = lockstruct_attrs,
 480 };
 481
 482 static struct attribute_group counters_group = {
 483         .name = "counters",
 484         .attrs = counters_attrs,
 485 };
 486
 487 static struct attribute_group args_group = {
 488         .name = "args",
 489         .attrs = args_attrs,
 490 };
 491
 492 static struct attribute_group tune_group = {
 493         .name = "tune",
 494         .attrs = tune_attrs,
 495 };
 496
 497 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 498 {
 499         int error;
 500
 501         sdp->sd_kobj.kset = &gfs2_kset;
 502         sdp->sd_kobj.ktype = &gfs2_ktype;
 503
 504         error = kobject_set_name(&sdp->sd_kobj, "%s", sdp->sd_table_name);
 505         if (error)
 506                 goto fail;
 507
 508         error = kobject_register(&sdp->sd_kobj);
 509         if (error)
 510                 goto fail;
 511
 512         error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group);
 513         if (error)
 514                 goto fail_reg;
 515
 516         error = sysfs_create_group(&sdp->sd_kobj, &counters_group);
 517         if (error)
 518                 goto fail_lockstruct;
 519
 520         error = sysfs_create_group(&sdp->sd_kobj, &args_group);
 521         if (error)
 522                 goto fail_counters;
 523
 524         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 525         if (error)
 526                 goto fail_args;
 527
 528         return 0;
 529
 530 fail_args:
 531         sysfs_remove_group(&sdp->sd_kobj, &args_group);
 532 fail_counters:
 533         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
 534 fail_lockstruct:
 535         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
 536 fail_reg:
 537         kobject_unregister(&sdp->sd_kobj);
 538 fail:
 539         fs_err(sdp, "error %d adding sysfs files", error);
 540         return error;
 541 }
 542
 543 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 544 {
 545         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 546         sysfs_remove_group(&sdp->sd_kobj, &args_group);
 547         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
 548         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
 549         kobject_unregister(&sdp->sd_kobj);
 550 }
 551
 552 int gfs2_sys_init(void)
 553 {
 554         gfs2_sys_margs = NULL;
 555         spin_lock_init(&gfs2_sys_margs_lock);
 556         kobj_set_kset_s(&gfs2_kset, fs_subsys);
 557         return kset_register(&gfs2_kset);
 558 }
 559
 560 void gfs2_sys_uninit(void)
 561 {
 562         kfree(gfs2_sys_margs);
 563         kset_unregister(&gfs2_kset);
 564 }
 565